File Name : File name of Device Table to save.

Frontend
See this page for special instructions on using the T100H/V receiver.

RX : Select a receiver from the list shown by pushing the button. Available combination for simultaneous observations are S40+S100, S80+S100, S100+T100H and T100V+T100H.

Ftrack : Tracking frequency. You can define up to six decimal places.

Single line obs. : Enter the rest frequency of the line.

Multi-line obs. (with single receiver) : Ftrack should be near the average of the rest frequencies of the lines.

*For high z objects, enter the frequency corrected for z. In that case, the velocity of the source defined in Source Table should be 0 km/s.

U/L : Select upper sideband (USB) or lower sideband (LSB). The common selection is listed below.
 

RX	Frequency range (GHz)	Sideband
H22	20-25*	USB
H28/30	26-35**	LSB
H40	42.5-44.5	USB
S40	35-47 47-50	LSB USB
S80	72-113 113-116	LSB USB
S100	77-113 113-116	LSB USB
T100H/T100V	78-104*** 90-120***	LSB USB

*Tuning ranges of the local (Gunn) oscillators of H22 is not completely continuous. The tuning ranges are 14.75-15.25 GHz, 16.7-17.25 GHz and 18.7-19.3 GHz.
**Tuning range of the local (Gunn) oscillators are 32.4-35.6 GHz for H28 and 37.0-41.0 GHz for H32.
***Tuning range of the local oscillator is 86-112 GHz.

Fif : Ftrack is converted to Fif by 1LO. Fif is converted to Fif' as listed below.
 

RX	Fif'
H22	Fif
H28/30	Fif
H40	Fif
S40	Fif + 4.0 GHz
S80	Fif + 4.0 GHz
S100	Fif + 4.0 GHz
T100H/T100V	Fif

Set Fif so as to be in the range of 5-7 GHz after this conversion. The commonly used values are listed below.
 

RX	Fif (GHz)
H22	6
H28/30	6
H40	6
S40	1.375
S80	1.375
S100	1.375
T100H/T100V	6

EQ(IN) : Equalizer number. This is set automatically by selecting RX.
 

RX	EQ
H22 (CH1) H22 (CH2)	3 6
H30	1
H40	8
S40	2
S80	4
S100	5
T100H (USB)* T100H (LSB)*	2 3
T100V (USB)* T100V (LSB)*	5 6

*The T100H/V receiver uses different equalizer number for the different sidebands. Make sure your keep track of the correct EQ# for the sideband you use. Click here for a graphical explanation.

Syn : Synthesizer number. This is set automatically by selecting RX.
 

RX	Synth
H22	2
H30	2
H40	4
S40	2
S80	2
S100	1
T100H T100V	3 5

Band Selection Board

EQ(OUT) : Select number of EQ(IN) of the receiver that you use. The available IF# of the receivers whose EQ(IN) is in 1-4 and 5-8 are IF(1)-(4) and IF(5)-(8), respectively. For multi-line observations, it may be easy to use one IF for one line.

• AOS-Wide : IF# corresponds to the number of spectrometers directly. For example, if you want to use AOSW1 and AOSW2 for one receiver, select  number of EQ(IN) of the receiver for IF(1) and IF(2). You can use up to 4 spectrometers for one receiver simultaneously.
• AOS-High : Since you can define the correspondence between IF# and the spectrometers freely, you can select any one from the available IF#.

BPF1 : Band pass filters with a bandwidth of 500 MHz (100 MHz step).  Select an adequate filter which passes the frequency of the observed line from the list shown by pushing the button. The number indicates the lower frequency of the pass band (e.g., 5.0 means 5.0-5.5 GHz).

Att : The power from the black body at room temperature for intensity calibration is attenuated by the rate defined here. This parameter depends on the system temperature [R-Sky value (dB)]. Typical values are listed below. But, you should decide the value after checking the system temperature.

 

RX	Frequency (GHz)	Att (dB)
H20	23	5
H28/30		5
H40	43	3
S40	43	4
S80	86	3
S100	86	3
S80	110	2
S100	110	3
S80	115	1
S100	115	2
T100H/T100V	78 - 120	4


Important note: If you are connecting any of the IFs to AC (at the backend), it is recommended to set the attenuator values to 0 for that particular IF. This also applies to the case when you are connecting a particular IF to both AC and AOS. (e.g. If you are connecting IF# 2 to AOS-W, AOS-H and AC, then set the attenuator value to zero for IF# 2. If you are connecting IF# 3 to AOS-W only, even though IF# 2 is connected to AC, then use the table above for the attenuator value of IF# 3.)

3LO : Frequency of the 3rd local oscillator (2.8 - 4.55 GHz, 0.05 GHz step). Fif' (after the conversion into the range of 5-7GHz) is converted to Fif' - F(3LO). Confirm that the frequency of the observed line is in the range of 2.2 - 2.7 GHz after this conversion.

• AOS-Wide
• Single line obs. : Calculate by the next equation,

F(3LO) = Fif' - 1950 MHz - 375 MHz,
where 1950MHz and 375 MHz are F(4LO) and the center frequency of AOS-Wide, respectively.
• Multi-line obs. (with single receiver) : If you want to convert Ftrack to the center frequency of AOSW, F(3LO) can be calculated as single line obs. If you want to convert a rest frequency,Frest, of the observed line (not equal to Ftrack) to by the center frequency of AOSW,  calculate by the next equation,

F(3LO) = Fif' -/+ (Frest - Ftrack) - 1950 MHz - 375 MHz,
where the sign of the second term is - for LSB and + for USB. If F(3LO) which satisfies the equation is not in the list, select the closest one.

Backend

IF : For AOS-High, select IF# which pass the line for which you want to use the spectrometer. For AOS-Wide, the correspondence between IF# and spectrometer is fixed.

BPF2 : Band pass filters with a bandwidth of 100 MHz (50 MHz step).  Select an adequate filter which passes the frequency of the observed line from the list shown by pushing the button. The number indicates the lower frequency of the pass band (e.g., 2.20 means 2.20-2.30 GHz).

4LO : Frequency of the 4th local oscillator (AOS-High : 1600 - 2099 MHz,  AOS-Wide : 1950 MHz fixed). Fif' (after the conversion into the range of 5-7 GHz) is converted to Fif' - F(3LO) - F(4LO) (- 540 MHz : for High). Confirm that the frequency of the observed line is in the frequency range of AOS (High : 45-85 MHz, Wide : 250-500 MHz) after this conversion.

• AOS-High : You can define up to the third decimal place.
• Single line obs. : Calculate by the next equation,

F(4LO) = Fif' - F(3LO) - 540 MHz - 65 MHz,
where 65 MHz is the center frequency of AOS-High.
• Multi-line obs. (with single receiver) : Calculate by the next equation,

F(4LO) = Fif' -/+ (Frest - Ftrack) - F(3LO) - 540 MHz - 65 MHz,
where the sign of the second term is - for LSB and + for USB.

Fcenter : Frequency which corresponds to the center channel of AOS. You can define up to six decimal place.

• AOS-Wide
• Single line obs. : Enter the rest frequency of the observed line to detect the line at the center of AOS.
• Multi-line obs. (with single receiver) : If you want to convert Ftrack to the center frequency of AOS-Wide, enter Ftrack. If not so, calculate by the next equation,

Fcenter = Ftrack +/- (Fif'-F(3LO) - 1950 MHz - 375 MHz),
where the sign of the second term is + for LSB and - for USB.
• AOS-High : Enter the rest frequency of the observed line to detect the line at the center of AOS. Check that the parameters satisfy the next equation,

Fif' - (F(3LO) + F(4LO) + 540 MHz + 65MHz) = 0.

*You can check the consistency of these parameters by Check Param on Device Table Window.

*For single line observations, you can use a sample file for a frequency which is close to your line with just changing both of Ftrack and Fcenter to the rest frequency of the line.

Frontend option

RX Init Angle : Position angle of the rotator of multi-beam receiver on the specified coordinate system in Scan Table. (+ : CCW)

Backend option

AOS-H2(9-16) : Expanded AOS (H 9 - 16).

AOS-U : AOS Ultra-wide (Band width is 512MHz).

AC : Digital backend.

AOS-H 9-16

Fig. 5.1.2  AOS-H2 Window


Fcenter : Frequency which corresponds to the center channel of AOS. Enter the rest frequency of the observed line to detect the line at the center of AOS.

AOS-U

Fig 5.1.3  AOS-U Window


IF# : Default is 8.

Fcenter : Frequency which corresponds to the center channel of AOS. Calculate by the next equation,
Fcenter = Ftrack +/- (Fif' -3.26 GHz - F(3LO) + 810 MHz),
where the sign of the second term is + for LSB and - for USB. 810 MHz is the ceter frequency of AOS-UW (560 -1060 MHz). If you want to convert Ftrack to the center of AOS-UW, get Fif and F(3LO) using the above equation.

AC

Fig 5.1.4  AC Window

IF	Beam
1	1
2	5
3	9
4	13
5	17
6	21
7	25
8	19

The relation between IF number and the beam number for AC.

Important Note: If you are using AC for OTF, make sure you are using at least 3 IFs regardless of the receiver in use.

(Jan, 2010) Check these instructions for setting up the AC with (non-BEARS) receivers.

Band Width : Select band width of spectrometers (4 MHz, 8 MHz, 16 MHz, 32 MHz, 512 MHz). For 4 MHz, 8MHz, and 16 MHz, a part of the spectrometer is used. Alphabet indicates the difference of the frequency range of the spectrometer. When you use more than one spectrometer, select the same band width AND frequency range.

FCenter : Frequency which corresponds to the center channel of digital spectrometers.

Window of LAG : Window function.  Frequency resolution (df) is calculated by

df = A * Band Width / 1024 (Hz),

where A is 1.21 (None), 2.00 (HANN), 1.82 (HAMM), 2.30 (BLCK).
Default is None.

IF8 is available from the 2008/2009 season. Note that the bandwidth of IF5 and IF8 cannot be set independently because of cabling reasons. If the bandwidth of IF5 and IF8 are set with different values, then the value for IF5 will be used.

*Att of IF# used for AC must be 0.

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